两种方式生成：

1、通过StringBuffer直接以追加字符串的方式生成XML文件

public class MainActivity extends Activity {

List message;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// 创建10条虚拟短信

message = new ArrayList();

for (int i = 0; i < 10; i++) {

Sms sms = new Sms("第" + i + "条短信", System.currentTimeMillis() + "",

"1", "" + i + i + i);

message.add(sms);

}

}

public void click(View v) {

File file = new File(Environment.getExternalStorageDirectory(),

"backup.xml");

try {

FileOutputStream fos = new FileOutputStream(file);

StringBuffer sb = new StringBuffer();

// 添加xml头

sb.append("<?xml version='1.0' encoding='utf-8' standalone='yes' ?>");

// 添加根节点

sb.append("");

// 每一条短信添加一个sms节点

for (Sms sms : message) {

sb.append("");

sb.append("

");

sb.append(sms.getBody());

sb.append("");

sb.append("");

sb.append(sms.getDate());

sb.append("");

sb.append("

");

sb.append(sms.getAddress());

sb.append("

");

sb.append("");

sb.append(sms.getType());

sb.append("");

sb.append("");

}

sb.append("");

fos.write(sb.toString().getBytes());

fos.close();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

2、利用XmlSerializer类来生成XML文件

public class MainActivity extends Activity {

List message;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// 创建10条虚拟短信

message = new ArrayList();

for (int i = 0; i < 10; i++) {

Sms sms = new Sms("第" + i + "条短信", System.currentTimeMillis() + "",

"1", "" + i + i + i);

message.add(sms);

}

}

public void click(View v) {

File file = new File(Environment.getExternalStorageDirectory(),

"backup1.xml");

try {

FileOutputStream fos = new FileOutputStream(file);

// 获取xml序列化器

XmlSerializer xs = Xml.newSerializer();

xs.setOutput(fos, "utf-8");

//生成xml头

xs.startDocument("utf-8", true);

//添加xml根节点

xs.startTag(null, "message");

for (Sms sms : message) {

xs.startTag(null, "sms");

xs.startTag(null, "body");

xs.text(sms.getBody());

xs.endTag(null, "body");

xs.startTag(null, "date");

xs.text(sms.getDate());

xs.endTag(null, "date");

xs.startTag(null, "address");

xs.text(sms.getAddress());

xs.endTag(null, "address");

xs.startTag(null, "type");

xs.text(sms.getType());

xs.endTag(null, "type");

xs.endTag(null, "sms");

}

xs.endTag(null, "message");

//生成xml头

xs.endDocument();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

最终生成的xml格式：

1465041254178

000

1

1465041254179

111

1

1465041254179

222

1

数据载体：

public class Sms {

private String body;

private String date;

private String type;

private String address;

public Sms(String body, String date, String type, String address) {

super();

this.body = body;

this.date = date;

this.type = type;

this.address = address;

}

public String getBody() {

return body;

}

public void setBody(String body) {

this.body = body;

}

public String getDate() {

return date;

}

public void setDate(String date) {

this.date = date;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

}